Two-cycle internal-combustion engine



Aug. 3 1926. 1,595,022

H. s. POWELL TWO-CYCLE INTERNAL COMBUSTION ENGINE Filed Mai-ch 19, 1925 I 55*; H- Q 5 35 v v 5/ .ea a7 3? 5a A TTORNEY INVENTOR Patented Aug. 3, 1926.

UNITED STATES HERBERT S. POWELL, OF UTIGA, NEW YORK.

TWO-CYCLE INTERNAL-COMBUSTION ENGINE.

Application filed March 19, 1925.. Serial No. 16,793.

My invention relates to a two cycle internal combustion engine and I declare the following to be a full, clear, concise and exact description thereof suiiicient to enable anyone skilled in the art to which it appertains to make and use the. same reference being had to the accompanying drawings in which like reference characters refer to like parts throughout the specifications.

The object of the invention is to provide a two cycle internal combustion engine or any even multiple thereof having a compressing cylinder and a power cylinder, whereby to insure the complete exhaustion of the spent gases resulting from the combustion of the preceding charge and to avoid any waste of the incoming fresh gases, also to permit high compression of said incoming fresh gases before they enter the power cylinder. Such a construction is adapted to reduce the number of valves to operate the system and will simplify the oiling, whereby topermit the use of the well known splash system.

The operation will be understood by referring to the drawings in which:

Fig. 1 is a central vertical section of the engine showing parts in elevation;

2 is an end elevation of the engine showing the crank shaft turned around at a different angle than that shown in Fig. 1 and also showingparts broken away.

Fig. 3 is a detail perspective view of the crank shaft made on a reduced scale.

F ig. 4 is a detail plan view showing a valve seat employed.

Referring more particularly to the drawings the invention embodies a casing 1 having a compression cylinder 2 and a power cylinder 3 connected by a passageway 4. A

one way valve 5 controls the port 6 that opens into passageway 4. Said valve 5 is held seated normally by a coiled spring 10 that bears at one end against pin 11 pro jected through an aperture made in the lower end of valve stem 12 depending from valve 5 and at its upper end against arms 15 formed integral with and projected radially from casing 1. Valve stem 12 rides in sleeve 18, also formed integral with and supported by arms 15. Furthermore, pin 11 limits the upward movement or degree of offseating of valve 5.

A piston 20. is mounted to reciprocate in cylinder 2. Piston 20 is connected to crank shaft 21 by connecting rod 22. The head 23 of connecting rod 22 has an aperture for the projection of a short shaft or wrist pin 25 that extends into the bearings 2626 formed integral with piston 20. The lower end 27 has a bearing casing 28 provided with a round aperture adapted to conform to the cylindrical surface of crank shaft 21. The counter part 30 of casing 28 is clamped thereto by bolts 31.

Piston 32, is mounted to reciprocate in power cylinder 3 and is connected to, crank shaft 21 by connecting rod 33 in the same manner as shaft 22 is connected to piston 20, by employing a short shaft or wrist pin 35 projecting through an aperture in head 36 and having bearingsin journals 37, 37 formed integral with piston 32. Its lower end 38 is clamped to crank shaft 21 by counter part 39 and bolts 40, 40.

The gas is admitted to compression cylinder 2 through intake port 41. The spent gases or exhaust leaves power cylinder 3 by way of exhaust port 42.

A spark plug is disposed in casing 1 above passageway 4, whereby a spark therefrom will'ignite the compressed gases after they pass into cylinder 3'to effect a power stroke of piston 32.

Cylinders 2 and 3 are separated by a space 51 adapted to aid in cooling the parts of the motor or to provide a water jacket or cooling fins as 43.

The operation of the engine is efiected as follows: The mixture of gas and air enters or rather is sucked into compression cylinder 2 by the downward stroke of piston 20 after said piston has passed below intake port 41. When piston 20 moves upward past port 41 said mixture of gas and air will be compressed thereabove. During this compression movement of piston 20, the tension of spring 10 will be sufficient to hold one way valve 5 seated to cause the compression of said mixture in cylinder 2. A very slight touch, however, of piston 20 against the lower end of depending valve stem 12 will overcome the tension of spring 10 and, thereby, open one way valve 5 to allow the compressed mixture to escape into passageway 4 and cylinder 3 where it is recompressed by the upcoming power piston 32.-

Immediately piston 32 reaches the top of power cylinder 3, the compressed mixture of gases and air will be exploded by a'spark from spark plug 50. The exploded charge of gases will force power piston 32 down ward, whereby to revolve crank shaft 21.

As piston '32 passes exhaust port l2, the exhaust gases will escape thereby. Immediately, piston 32 passes exhaust port l2 on its return upward movement, compression piston will have moved below intake port 41 to allow for the admission of another mixture of air and gas to be compressed in said cylinder 2.

It will be observed that on the succeeding stroke of piston 20, power piston 32 will move upward past exhaust port 42, whereby to close the same before compression piston 20 strikes the lower end of valve stem 12 to open valve 5. To this end the arms of crank shaft 21 are offset less than one hundred eighty degrees to each other, whereby power piston 32 will follow up suction piston 20, so as to be on the upward stroke to close exhaust port 42 before piston 20, also on its upward stroke, will strike the lower end of shaft 12, as above stated. A. member 52 is mounted on the upper surface of the comsaid passageway, a spring for holding said valve on its seat and a spark plug located in said passageway for exploding said mixture of air and gas.

2. In a two cycle internal combustion engine, a cylinder having a piston for compressing a mixture'of air and gas, a second cylinder disposed in parallel relation to the first named cylinder and having a piston for exploding said mixture, a passageway connecting said cylinders, a valve actuated by one of said pistons and located in said pas sageway for controlling the same, a spring for holding said valve on its seat, a spark plug located in said passageway for exploding said mixture of air and gas, a port disposed in said first named cylinder for the admission of said mixture of air and gas and a port in said second named cylinder for the exhaust. e

3. In a two cycle internal combustion engine, a cylinder having a piston for compressing a mixture of air and gas, a second cylinder, disposed in parallel relation to the first named cylinder and having a piston for exploding said mixture, a passageway connecting said cylinders, a valve actuated by one of said pistons and located in said passageway for controlling the same, a

spring for holding said valve on its seat, an exhaust port disposed adjacent said second cylinder and means for closing said exhaust port before said valve is opened to admit the charge of air and gas.

In testimony whereof I afiix my signature.

HERBERT S. PGVJELL. 

